Investigators said it all started with an argument between him and his father and escalated when Vandervorst threatened to kill. His father called 911 after he heard the sound of a semi-automatic gun being charged.

Lane said the family notified authorities on scene that their son has a mental illness and may have been on drugs. The family also said Vandervorst had access to guns.

“The knowledge that they had with the weapons involved, the bullet proof vest and those different things, the lack of communication certainly is going to play in to the situation,” Lane said.

Lane, who is in charge of crisis intervention training, said deputies would not have been able to end the standoff without knowledge of how to deal with mental illness. He said more than half the deputies on the job are certified.

“(The training) puts you in the understanding of what that individual’s mindset is,” Lane said.

After 11 hours of negotiating, deputies were at a dead end. Authorities had to use tear gas to get Vandervorst out of the home.

“Never have we had to go to the SWAT team, so this was a drastic situation,” he said.

Authorities placed Vandervorst in emergency protective custody. On Tuesday, authorities said he called his family from the hospital, threatening their lives. He is now facing several felonies, including assault and terroristic threats.